The coolant will still go through the TB, and other accessories with out going through the heater core, my idea is if the core isnt at 200°F then the evap will work more efficiently because the entire AC box wont be heating up. The AC will always cool at full blast, and the heat will always heat at full blast. Your A/C and Heat knob only adjust the flow of cold vs hot air from the vents, but the components run at full duty cycle when ever turned on
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View my fuel log 2018 Mirage Es 1.2 manual: 41.6 mpg (US) ... 17.7 km/L ... 5.7 L/100 km ... 50.0 mpg (Imp)